Some plastic windows are better than others.
Read through this Soft Top sourcing thread. Plastic windows are mentioned.
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There's many soft-top manufacturers and resellers, I did not research them all.
Most practice what we call in French "flou artistique" in their statements, an artistical somewhat out-of-focus form of speech. Like calling the fabric "German, "factory", or saying "first-grade" plastic windows, etc. If you look up the sites, this form of speech is practiced by most, from the cheapest to the most expensive.
A cat is a cat, and a dog a dog.
There is only one replication, and only one, of the original OEM R107 fabric. It's called "Sonnenland Classic" made by Haartz. It's a two fiber weave (cotton-polyester I think) and too expensive-marginal to bother to copy as is.
There are fakes. Some are good, but should be stated as such, and sold at a much lower price.
There is currently a better fabric, the post-1994 or so Twillfast-Sonnenland A5 (Twillfast is the name used for US cars, Sonnenland for Euros), which has a black-only dobby backing ie a black-only correct pattern inner lining. Reputedlly, this lasts longer than Sonnenland Classic.
The regular Twillfast with correct brown dobby is also reputed excellent.
Sonnenland Classic is reputed to look nicer than Twillfast.
I'm of the opinion that both Sonnenland Classic and Twillfast will last a long time, most probably so than the plastic windows. So, it's between price and looks for the outer fabric.
Only one supplier confirmed that he used a high-quality brand-name plastic for his windows: ARO 2000. I think that this is a decisive factor: many fabric tops can be seen to be in VGC but for their windows.
ARO 2000 uses "Ultralite" by O'Sullivan USA and swear by it. It's a product used by car manufacturers, not only aftermarket. OK, but it seems that Bayer Flexglas 9120 (I think, the one used on BMW Z8s) is better and suppliers should do some research.
So, do business with whoever you want, but before you order, have it confirmed of what, EXACTLY, your top is made of. "German" and "high-quality" is not enough.
My personal choice...
I hesitated between ARO and Prestige tops.
Unfortunately, I asked, no begged, for Prestige to confirm fabric and plastic used. They declined to name the products they use. Note that I stated in a previous report that they used Bayer et al. Flexglas (r) for their windows. That's before I discovered that Flexglas is like Kleenex, a brand name used to describe similar products. I asked Prestige to confirm they used Bayer et al. Flexglas(r) -an excellent product- and they declined. Too bad, because they did seem more thanOK, at a great price. But if they deem their clients unworthy of info, so be it.
In the end, only ARO 2000 provided complete, precise information about their product. Mr. Georgi answered each and every of my questions. They get my vote, and they'll get my money.
In closing:
1-you other soft-top suppliers, wake up and inform us consumers.
2- If you want to charge us more than 30-50% the average, tell us why EXACTLY.